# Sketcher: Constrângere de Unghi

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Menu location Constraint InternalAngle Sketch → Sketcher constraints → Constrain angle Sketcher A - Constrain distance, Constraint Perpendicular

## Description

Angle constraint is a datum constraint intended to fix angles in sketch. It is capable of setting slopes of individual lines, angles between lines, angles of intersections of curves, and angle spans of circular arcs.

## Cum se folosește

There are four different ways the constraint can be applied:

1. to individual lines
2. between lines
3. to intersections of curves
4. to arcs of circles

To apply angle constraint, one should the follow the steps:

• Select one, two or three entities in the sketch. The mode will be chosen depending on the selection.
• Invoke the constraint by clicking its icon on the toolbar, or selecting the menu item, or using keyboard shortcut. A datum edit dialog box pops up.
• Modify the angle if necessary. The angle can be entered as an expression that will be evaluated and the result will be stored. Click OK.

As with any datum constraint, it is possible to change the angle value later by double-clicking the constraint in constraint list or 3d view. Entering a negative value will cause the angle direction to flip.

## Constraint modes

### line slope angle

Accepted selection: line

The constraint sets the polar angle of line's direction. It is the angle between the line and X axis of the sketch.

### arc span (v0.15)

Accepted selection: arc of circle

In this mode, the constraint fixes angular span of a circular arc.

### between lines

Accepted selection: line + line

In this mode, the constraint sets the angle between two lines. It is not required that the lines intersect.

### between curves at intersection (angle-via-point) (v0.15)

Accepted selection: any line/curve + any line/curve + any point

In this mode, angle between two curves is constrained at the point of their intersection. The intersection point can be on curves' extensions. The point should be specified explicitly, since curves typically intersect in more than one point.

For the constraint to work correctly, the point must be on both curves. So, as the constraint is invoked, the point will be automatically constrained onto both curves (helper constraints will be added, if necessary), and the angle between curves will be constrained at the point. These helper constraints are plain regular constraints. They can be added manually, or deleted. There are no helper constraints on the example picture above, because the point selected is already the intersection of curves.

## Script

Angle Constraint can be created from macros and from the python console by using the following:

```# line slope angle

# angular span of arc

# angle between lines